epoxy question

[Lost81c10]

I shot some epoxy on my roof on Friday but had some equipment issues that kept me from being able to finish. I shot two coats but wanted to shot a third since my truck will be sporting the epoxy for some time. The weather has not cooperated yesterday or today. Tomorrow at around 5 it will be 72 hours. If I am able to shoot inside the 72 hours, even if it is by two or three, I won’t have to scuff it correct or will it be better if I do? Also in either case, do I use wax and grease remover to clean the roof before shooting it again? I am hoping I can get the roof heated enough with these lights. Do you think they will work? Thank you.